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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be9e642e619eb2886be7b34101cc9de1386d9f0dc495c72ae7a5604ae61764a' 
  AND token = 'XrSPgHaV55jy5RIfWFG4uMQ+VH1DcyBb15xHVROd/H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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