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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69f93cea440bcd6c4553bfa73d1d9c6cbcd74c37a2389c2f30d89b7df7a66b1' 
  AND token = 'MhbF0x+71BIV9/fYpemS7sbQhmv458kjXrk1/6OVeI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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