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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc2737d306e042dffa83df4685ae9dc8213c6e39e0651e68a7eb80c4e33da67' 
  AND token = 'ud9vrul938UtYZq1rPIY1WslOhU0jD40qbXhce5Rfws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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