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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31e60836cce6d260d3723ccccc211d36a50e83aae3634e1140c4af0b104acc4' 
  AND token = 'GShZ0+vZL3drHvPyBNLbNG1Ghwky1xSPwj42+JtT/9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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