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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1fad7601de7c28a0a8f9125925ba50957800caffa2b9860f6c7e11d3e5c083' 
  AND token = 'PpwKC3r0+kxK0q5loSTt9cNjo+wRyrIuKw29uDeNHVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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