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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e904d53ab7f90241b89e2746a4d99d30d92c93e9c6206572501af211e21d3302' 
  AND token = 'WPcTyK5k+DeiP4F/71tLAZr9rxmkNervbEYSJoOKXR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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