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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de84c4256d967f75a56f31a8c5a91797cebb97e9749e445ca7f73e745e23cc93' 
  AND token = 'kY7+DDynzM7djT3B/gMbJvdX6/gCnncjsf2NQwNnAqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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