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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5034128f14adcdea26ec4b34e827ef6a9711beb03b20aa36c7bdbfffc06439' 
  AND token = 'QcPw/YL74X/owupgPD6GvLPPb0iEaoWP4NC1LhjelOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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