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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c2522894f2cb6832382da78e8ab81deeaeb2660fdd1f39cee3e4a35751ec81' 
  AND token = '4VzwspEQ9X4zSE1GCFmEE2u6809cEwuBn8V1vsa+iQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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