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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb328e0dac9b087d700c0c97d20c06a20bed5a768e24414e1c3e759c2b870f2' 
  AND token = 'oB44znePQlLf0v8MCA5QVD85XLUZ9vPTFLIiaCW8xOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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