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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c717f686cbc8531728efe87065a83848dac0167e4e435e41245b85344bb757c3' 
  AND token = 'Y/Zf3j/kOBjW71oJfqXMm9fKnMMGbdetNGiJxd2odRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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