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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcfcb438ff162899de162a7980a48f91df1a2febf1238344d654c914bdfa418' 
  AND token = 'd5+EHPqapUlMV6DvEpbV8+XAOEvBowluhmcAAELgFrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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