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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea118463f79eb771273c56362c078c4d4868a9122f2d851662adf46d135763bd' 
  AND token = 'f2X3Un5Vb6Cu0S87KzyjCzCs+9UO4SgJCYawr3VVuw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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