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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13b9ed55202ac747a3068a764881b3edb9ebc4eeeb94c4e109b1bec2173f6e9' 
  AND token = 'B2w/L6eso6yBz64VjzHidF2W4I83KBXtdO1TMeL1+4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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