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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43d82ae597e25957db7e546475e8de3f5d2599ba06ae3733a7255ffa56e0855' 
  AND token = 're5bRF+C0ka04LgdIbY6A6OcNvI/EdfPR6MGM+4o8sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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