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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bed692824e247adf64f3b16ac1dd1b82b2c2c3cc9dc4fea54560055e46eb27' 
  AND token = '7lsxF+eV6IOYPSHitt+bwaldNUe62RlXJMqc2d6k3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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