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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948e6762527bfe38dd3d380d511d7e39ee3451233412dcccc991fde9f76fd15c' 
  AND token = 'x9sl9BrBseHm8aetJZmSfKQw8jkR4TJ3NTv4RBCqCaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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