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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6fba2cac79e0fec0ebfefed93ec7e9c6ed55080a6b45d48c32b43ad2f14210' 
  AND token = 'Lf9Se/ZSpTTovzO8H6b6j/ReYOonqFecJQqAu45xg4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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