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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4e184f262e33d94cb7dbebc325e242fcb9705fa5ae5238adca53147386ad2c' 
  AND token = '+V4J/omjFQf6tY7tAYQC44OiTGygtENsYn+ZHm4ted4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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