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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a004557bdb4cd8575a5b742ef425160e9868d257353c0b794dffbc4bca163269' 
  AND token = 'c+GounIlCApAUk4A8I/oAkk0rwIKtxFbgl+vH2MlkKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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