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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2bcdf3c8fc2c73464d8e1af95e492294b060cf6af79e15f9e85a7085454f7a' 
  AND token = 'Vj61xF1u2XTqMddQjs6PdVi7UYR9R3jJHsg2WX8hRXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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