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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfdd7c5f1e0cd3b0f6f1856594190d57d165cabe1142653092c547b14bbaa4fb' 
  AND token = 'R/Q4cDSkLKYFNwZovI+n99K0lcezUMuNeBdUlHoAT0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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