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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab9eb053d0ec170a8820a0a19c64d5e13f3d17a4ed1938328e117f62fff647' 
  AND token = 'ick/H672/gZgUdqliu5T8pgBYA5lDt8mJpM/PRw0YHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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