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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e703168febbb7ec6d44bfa1b073404fe2d96cc5499e1ce68518770b685f19d' 
  AND token = '7z3JMCviP3nqF3c330IkQrqIkzGk7YfbwOrVG64JGG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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