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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd436bf5fb81873a2f5746067c17212161b43c783e5db75c7f19acf3e8965a75d' 
  AND token = 'h7I83ZPSWb03lGaTqkqtqKZdyoTol59whG8k7zEHpZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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