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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb948d41f0be1cd6d15d7508c768dc9cd915af77eb6c6dec165bbeae1e542ae' 
  AND token = 'SduAY9K4hpvx7vBwPa2gD2gKbtE10o2HeFkvCLw7D3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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