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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c44ee731e3bd7c026a0cf9e9e2ae4b0924b6258f20b2c6b5810a9e5d96f954' 
  AND token = 'ZAnTMkdj7kFbxLmwJ9mbTbnurRh39MzP+dMoVP1AqOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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