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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60931fa1f8f9f01b17d8e93c9fa2b5ca05a21482c2f8d23dd74038ae5e77d055' 
  AND token = 'JI5NQXW1v7X1PGyuJRJb/5LRfzs6kP1Fk7FSx7y/5l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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