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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57f4e743a2618171b7900e54926cba269e75f715388460e7619ddcf7b9b03b0' 
  AND token = 'TAL1qpsT7JIXhaoCL41h1fEVqkZHbXyIGL9RTwlsqz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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