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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ea98cb26bcdf989893aa8df50bd050e1cea63655a6cbe484266156614a36cf' 
  AND token = 'pZT8ULVeqwQgeaFzViT3rChTujU5ghqbcSfsI1mENhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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