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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6111e172223afe02014c1a540ffca91f1d0c11ca65703550c895cd9b61a2086b' 
  AND token = 'fTp5KvraLU8R+dpq4CHSzmIkXwIPNoSfnh9GWFo929E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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