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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cdc7fdcebfd09e08b67aac3c3219a88d9fa79f257f381b52fd1d54618d031f' 
  AND token = 'RZ/ha/FK6ydB9EY1wZ9dysbj3Axdinv5lB1THfVT74o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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