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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334f9ce8a127d7b48a5c094864d335b9859ff5a9a3848a70856bc5c0e6feba55' 
  AND token = 'y/qQ7+oz//6BcRjlNMf2cI8F942x+BqERUoH0ygBKK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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