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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67af5b3ce580d4bda289e0120306c5beb31baed8ef12dc3ea61b73594839337a' 
  AND token = 'kmaX9CEN/o2Q65BWtGB6WeHVpM0qmje6Kkm4v8InUV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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