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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbd0c8da5642dd1e9dcb5a54cfd34c84b7283e796f2b962574a2f26cf9844b1' 
  AND token = 'anHPerdN3AUI5M+n5ahQLaOGOtvEeff64tsqbQLcQtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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