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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3a29da0b7ac3ac26b1e0ae08722fd9655d0be3a532442acebb05418591d4dc' 
  AND token = 'X33fo0lqTC7kYmDYM8cDBP8O8HWmb0QDIxkTUxmtrPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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