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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0b829c90b8147843b9a731c15812599c9af25b7a82d2a2272d3f6f8d13d250' 
  AND token = 'FuuglvQzu9TrIF6HaYTKANE5aND8RO6aFk1PG37TgtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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