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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5529f6a51140d6b890a8ab25e565a0eb47e6d5ae063199a86ff92fb27e43b68f' 
  AND token = 'FLnhemgAb4jmuFCxhVMzxs2aTdkgeIxPV2DgSNf1CuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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