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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c35c2c8a0ddb391e34e5a2c55071cd630dbac8e8713c61d0d6cff5424931d77' 
  AND token = 'bVckVBrf+4axha9KNzn6ksuE0CswwzCQ/X0R1XmUWX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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