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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24ae055a841b2670f14b493058fc4edb265626631f8f6d09afb885bd4e64d78' 
  AND token = 'CzHvpfTCeNoMSTUxq2QkDo2LLq0AHG8tU/3Zdjm+ACs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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