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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c25ff79195e42b1df0a38078801de3d379fbab27e6fb464b1ac33bb4c7b655' 
  AND token = 'bhAYkjS1wa+sME9g1bIddu0YGJInpb0Cy72aKWW625I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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