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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0651d596a5e327501fa9654457b299acd802d82d25c78661e6dc3e07093b8089' 
  AND token = 'rsgHGKtEWZgclNiGqGPSiq+0fwQ31JkZzHusfJc7FeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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