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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444980bc44524b1b2b6acc7a7e41c77b10374f204092f587a30d6869cdb4106b' 
  AND token = 'eHekf5SbSquJRrveP+YY4GEf+XkrDjfvTu7fxzVqT5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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