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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605742a7fcb9e0fc965bee06b09a5ad97010c671aaea91bc8dd6225ae631d21e' 
  AND token = 'wFJqhT26jCbtWK+UrBX9+NEUg++UqNhXNaKLG9vu1g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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