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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961a5855f981acc740ffa5cba82ca8e6de8d00af265c20db6b3b80aec1d31b70' 
  AND token = 'OfoL2O1SjhG7LeC+O1/Fxa9EoUJ+rHeNxtWP4KeGAoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}