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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b16e7cec267a6cdd47365a125e5bad681df0ab37c08efc7ced880fbe39c1a8' 
  AND token = 'j4WJvFHnBnr36X0cWyekdBdvLWYh1fPhIbvGrbL1KV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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