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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c03750f0e14b19b04bbdc25d0d70897099a3b146548ac49ef626b6189c860c6' 
  AND token = 'HezsbBJ0c3r/qIre1PGpJys4strgsqg+HslwlvBtijk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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