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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efd5fbd9ba604b8229482d845ff60702afa4f238a2bcfd116d289de44e95dc4' 
  AND token = 't42sgScfWfaDAY5Wj0+tcz8/bok6bS2Lr5vPfHt6/EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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