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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b0d92eeef9c65249b8f66c77c85bd620340f104ccd5e073ff09c186392c1a1' 
  AND token = 'gTwLejLklZ8THgLlD6qvwxtRY+At5p4rzbAnighS8c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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