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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056a073ebad786fca708c3de895aeedb303421af035ee5670a0be31c9df536b4' 
  AND token = 'AxJE329g0Bt8SDhj0SbzUPgV1Agrb0YHqtBDShEUBD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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