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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f17c25373dcb9c904fea30f8ea60167cd103007c9f4366304b97ddf6d0789b1' 
  AND token = '0MbBzn0kDI+Q3PeU40UxYJqdIlBG4/AH6G7e62bf9oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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