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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b0cb1cd748dbd6792c1bc5156ff870095b862329d042475c5cfcc99c538d26' 
  AND token = '+g8oHylVwoBUbSfpE0cUDUCE4Dt+UQsD51JtMraSxN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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