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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61947b58aca17537c87c62d80e3c33a82411a951701277a7d99c59831960a02f' 
  AND token = 'tAIP1NPV1i5tJKq6JnOz7ok9CDX0Uq8TMiVjetadmPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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