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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3235fb970cd1ffac9ca097001426859ab6832b2b60e3f73edff77a550a92bdb4' 
  AND token = '4tW4XQOno2mOBSi06KduB2uwbrt5ONv3eu0do/abMPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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