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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064c2e366d34fcb794bdf581525c5b950ed32da437b1e28f3ec2e9ed501e4948' 
  AND token = 'zvQd3HQ7aJYhWId6OV1940jIL6L/+c72YJ52jExSD8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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