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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb9d5c9fc26c003a55830d86ccf0cd367888f9300d0613ee1bdebf65bbdb859' 
  AND token = 'RJsLReYZk2oL13Gl0yIfcLn6VSsb8MWN8laCBpUO1mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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